Only show Delete if owner

Also changed so that Edit only showed to Admin's (though non-admin users should be unable to get to this page anyway). Kanban tickets:

https://aptivate.kanbantool.com/boards/5986-econsensus#tasks-1256913 (owner)
https://aptivate.kanbantool.com/boards/5986-econsensus#tasks-1388749 (edit)